What is SLI???

If you mean "what is SLI?", then basically it allows you to connect 2 video cards together. Read Video Cards 101 for more info.
 
Scalable Link Interface (SLI) is a method for linking two (or possibly more) video cards together to produce a single output. It is an application of parallel processing for computer graphics, meant to increase the processing power available for graphics. An initial version of this technology (called Scan Line Interleave) was introduced by 3dfx in 1998 and used in the Voodoo 2 line of graphics accelerators. ...
 
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